ALLEN PARK — It was confirmed on Wednesday’s injury report that Ziggy Ansah, the Detroit Lions’ rookie defensive end, has a concussion.

Ansah was on the field Wednesday morning as the team prepares to play the Minnesota Vikings in the regular season opener on Sunday. Unlike on Tuesday Ansah ran under the watchful eye of the trainer which is part of the NFL’s concussion protocol.

If Ansah is cleared for contact, it’s possible he could play on Sunday.

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Coach Jim Schwartz would not comment about Ansah when he met with the media, three hours before the injury report was released.

“There’s no sense giving any of our opponents any kind of information on where we are with injury, starting lineups, how we’re going to line up on kickoff team or anything like that,’’ Schwartz said. “I don’t have any updates on anybody’s playing status.”

This is totally consistent with Schwartz’s philosophy on injuries.

Ansah took a blind-side hit from teammate Leroy Harris on Aug. 24 during practice. He has not practiced since then and missed the final preseason game in Buffalo.

If Ansah is not cleared to play, he will likely be replaced by Willie Young at right defensive end. Young has played in 32 games over the past three seasons but has never started.

Delmas limited

Ansah was the only missing player at practice.

Louis Delmas was on the field, but according to the injury report was limited. This is not a setback. Delmas is being monitored so he’ll be ready for Sunday’s game.

Calvin Johnson who missed substantial time during training camp with a bruised knee was back at work for the second straight day.

Owens to IR

The Lions officially reported that running back Montell Owens (knee) has been placed on short-term injured reserve. He will be eligible to return in six weeks.

To fill his roster spot they brought back linebacker Rocky McIntosh who had been signed during camp.

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